3.3
Power losses and air cooling requirements
Overview
To protect the components from overheating, the control cabinet requires a cooling air flow,
which depends on the power loss of the individual components.
Measures in order to ensure that the components are adequately cooled
● Add the power losses of the individual components.
–
– Use the manufacturers' data for components, for example reactors or filters.
● Calculate the air flow required:
airflow [l/s] = power loss [W] * 0.86 / ΔT [K]
Power loss: Total of the power losses of the individual components.
Δ T: Permissible temperature rise in the control cabinet.
● Ensure that the control cabinet is appropriately ventilated and equipped with suitable air
filters.
● Ensure that the components maintain the specified clearances with respect to one another.
● Ensure that the components are provided with adequate cooling air through the cooling
openings.
● Use appropriate air barriers to prevent cooling air short circuits.
● Ensure that the electrical cabinet is adequately ventilated and is equipped with suitable air
filters.
Comply with the replacement intervals of the air filter.
Mounting
3.3 Power losses and air cooling requirements
SINAMICS G120X converter
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC
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